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The smallest unit is the Planck Length. Theoretically, it is not that there can be nothing smaller, but for various reasons that have nothing to do with the limits of technology there is nothing that can be known about anything that happens to be smaller. For scale, the number of Planck Lengths in the diameter of a proton is 10 to the twentieth power.
Yes, there are units smaller than a yoctometer. The yoctometer (10^-24 meters) is part of the metric system, and smaller units can be defined using scientific notation, such as zeptometer (10^-21 meters) or even smaller hypothetical units, like the Planck length, which is approximately 1.616 x 10^-35 meters. However, these smaller units are primarily theoretical and not commonly used in practical measurements.
Planck length and Planck time Planck time is the time it would take a photon moving at the speed of light in a vacuum to cross a distance equal to the Planck length. The Planck length is 1.616252 × 10−35 meters, and the Planck time is 5.39121 × 10−44 seconds. Links are provided to the relevant Wikipedia articles.
somewhere around 4*10^184 planck cubes could fit in the obervable universe and those are a lot smaller than electrons. So that number would be somewhere between a googol and this number.
A centimeter is smaller than a meter